Lever mechanism



H. B. TARBOX LEVER MECHANISM Sept. 5, 1933.

2 Sheets-Sheet 1 Original Filed Dec. 9, 1927 H. B. TARBOX LEVER MECHANISM Sept. 5, 1933.

Original Filed Dec. 9, 1927 2 Sheets-Sheet 2 Reissuecl Sept. 5, 1933 v UNITED STATES LEVER MECHANISM Hugh Bogart Tarbox, Toronto, Ontario, Canada Original No. 1,810,990, dated June 23, 1931,-v

Serial No. 238,788 December 9, 1927. Applica- I tion for reissue'January 21, 1933. Serial No.

7 claims. (01. 74 110) This invention relates to lever mechanism of the toggle-lever type, and my object is to devise mechanism of this type particularly adapted for use in mop wringers in which there is employed a stationary presser board and a movable presser board mounted to be moved to and from the stationary board. a

In such mechanism it is desiredto make the toggle mechanism as simple and compact as pos l0 sible while giving a long throw, and to provide for a rapid preliminary movement of the movable part towards the stationary part and a slow powerful final movement.

I attain my object by mounting a pluralityof angularly spaced lever arms on a rock shaft and by providing engaging means whereby when the shaft is rocked the lever arms successively en,- gage at difierent points in its length, a link connected with the movable member.

tive relationship between any one lever arm and thelink until the other lever arm has been engaged, thus preventing the disengagement of the link from the arms by a rocking movement of the former; r

This object is attained by forming the parts with interengaging recesses and projections which, when engaged, interlock sufficiently to resist a rocking movement of the link, other than that of normal operation, and in which the interengagement of one lever arm with the link preferably overlaps the interengagement of the other sufficiently to leave no intermediate position in which the link is entirely free.

The invention is hereinafter more particularly described and is illustrated in the annexed drawings in which Fig. 1 is a diagrammatic view showing the lever mechanism in the initial position and show- 40 ing in dotted lines the position of the lever arms,

link and movable member at the point of engagement of the link by the following lever arm;

Fig. 2a similar view to Fig. l showing the lever mechanism in its most extended position and showing in dotted lines the initial position of the movable member;

Fig. 3 a perspective view of a mop wringer showing the lever mechanism applied thereto;

Fig. 4 is a perspective view, on an enlarged scale, partly broken away of the lever mechanism shown in Fig. 3; and

Fig.5 a perspective view showing the link pivoted to the movable presser board of the mop wringer. p ,In the drawings like numerals of reference in- A further object is to maintain the co-operadicate correspondingparts in the different figures.

Referring to Figs, 3, 4 and 5, a pair of lever arms 3, 3 and 4, 4 arranged in angularly spaced relationship extend radiallyv from each end of a shaft 6, and are connected by an elbowor boss 5 on the'sfhaft 6. Each of the arms 3, 3 and 4, 4 extends from the shaft 6 in a direction parallel. to the corresponding arm at the other end of the shaft and in the same radial direction, so that similar movements will be simultaneouslyeffected by the arms of the two. sets and similar pressure will be simultaneously exerted by them on the movable presser board '19.

.The shaft 6 may be solid or hollow and rock-.- able on an axle '7 as indicated in Fig.4. The -solid shaft 6 rocks in bearings in the side plates 9 of the stationary frame, which includes the presser board 17, and a lug-8 on the end thereof retains the shaft 6 in'position. Where a hollow shaft is used the axle 7, only, "extendsnthrough the side plates 9 and the lug 8 is formed on the axle '7.

The shaft 6 is provided with a handle lfi for rocking said shaft and said arms.

Co-acting with each set of arms 3, '3 and 4,.4 is a link 10, one end of which is pivoted-by means of a pin 11 to a lug on the movable presser board 19.

Interengaging means are provided whereby the lever arms 3 and 4 at either side ,engage successively the adjacent link to form a toggle to actuate the' movable presser board towards the stationary board, and preferably also to effect the reverse movementthough such reverse move-- ment may be by means of a. spring as hereinafter described. v 7

The saidmeans, in the embodiment of the invention illustrated comprise pins or projections 12 and 13 on the arms 3 and 4-respectively and shoulder forming recesses 14 and 15 in each link spacedfromone another longitudinally of the" link to successively receive the pins 12 and 13.

In describing the operation of the device and further details of the lever. mechanism reference will bemade only to one set of lever arms and its corresponding'link, but it will be understood that the operation of the other set .of leverarm'sf' Fig. 1, when the lever arms are moved forwardly or in a clockwise direction pressure is exerted on thelink IO-by the leverarm 3 causing the link to move forwardly or away from the shaft (land imparting a" similar movement to the movable presser board 19. The movable presser boardis. I pivotally connected at one end to the side walls 21 of the stationary frame of the mop .wringer by bolts 23, 23 extending through said side walls and hubs 22, 22 formedon theends of the side walls 21', 21 of the movable presser board 19.

Therefore, the movable presser board under the pressure exerted by the leverarm on the'link describes a swinging or arcuate movement.

,As the lever arms are further rotated in a I clockwise direction the projection 13 on the lever arm 4 enters the recess at the end of the link 10 and the'projection 12 recedes from the recess 14 whenthe projection 13 is engaged; As the lever arms are'still further rotated the *link 10 and presser board 19 are further advanced by the lever arm 4unti1 the lever mechanism reaches its most' extended position as shown in Fig. 2.

' .that when a pin or projection is engaged with a Springs 24 bearing against the frame and the sidewalls 21, 2 1 of themovable presser board exert a pressure tending to cause the movable presser board 19 to return to its initial position when pressure is released on the operating handle 16, and to keep the link 10in positive contact with the {lever arms.

The'recesses 14 and 15, which form shoulders against which the projections on the lever arms be'ar, have their forward sides 14 inclined in a direction rearwardly and towards the shaft so recess thetwo cannot be disengaged by a simple upward swing of the link until a second projection and recess have been engaged and as long as pressure is urging the movable presser board towards the shaft as will appear from a consideration of Figs. 1 and 2 of the drawings. The side 14 of the recess14extends rearwardly towards the shaft at an angle which'permits disengagement of the leading lever arm 3 when the following lever arm '4 engages in the recess 15,

and the side 14 0f the recess 15 extends at such an angle that the following lever arm 4 may engage the recess 15 when the leadeing arm '3 disengages; While it is essential that the recess 14' l and the projection 12 should be located on the link andlever arm '3-respectively, it is obvious-that j y the positions of .the recess 15 and projection 13 are reversible; a g a positive return' movement of the movable presser board may be desirable under some con-- dit'ions, ;.Iprefer to arrange the interengaging" means: asfollows: The projections 12 and'13 are formed as keys and the recesses are so shaped that a key can onlyenter and recede from 'a recess in one predetermined position. As shownjn the drawings'the projections are'rectangular in cross-section, one diameter being considerably longer thanthe other andthe longer diameter of each projection being slightly less than the 'wi'dth the corresponding recess at its widest point and 5 the shorter diameter being slightly less than the width of the restr ictedneck 1d of the recess. In Figs. 3 and 4 the arms" 3 andlj4'fare shownas beingslottedfto embrace the link 'ahd the projectiflnstf'and 4"extend from one sideto the other of '-..the' slotted portion; 3 r

neck 14 so that it freely'enters the recess.

Each projection' or'keyis"arranged so that as it ar'r ives at ,the' point in its swinging -movem ent where it enters or'recedes "from the corresponding recess'itpresents its'shorter diameter tothe How ever, it continues its movement' it rotates relative to the said neck so that its'longer diameter is presented to the neck and consequently it cannot be removed from the recess, thus retaining thelever arm in positive inter-engagement with the link.

The release positions are'so arranged that at least one of the lever arms is interlocked with the link at any given point in the range of operation. l Q

*As shown in the drawings the arm 3 is longer than the arm' 4, and during the forward movement'is in advance of the arm 4 for imparting quick action to the movable presser board 19 during the initial step of the movement, as during this step the preliminary wringing action takes'place and less power is required. At the completion of the initial step the shorter follow- "ing arm 4 comes into action. and completes the -movement initiated by the arm 3. This shorter arm imparts a slower movement but exerts greater leverage for the final wringing action.

In the mop wringer shown in Fig. B the side walls 9 of the fixed or stationary frame are forked for straddling a pail. A stationary presser board 1'7 is mounted between the side walls. The mop to be wrung is placed' betweenthe two presser boards and pressure is then applied to the mov- The fixed-presser board 17 is shown as being perforate-and the movable presser board imperforate and provided with a transverse base board or floor board 21 adapted to close the space between the lower ends of the presser boards.

Although the lever mechanism has been described as applied to a mop 'wringer, whereit is particularly useful, it is illustrated, particularly in Figs. 1 and 2 in a more general way and may be applied to any similar purpose.

WhatI claim as my invention is: 1 1. Inthe hereinbefore described device, the combination of a rock shaft; a plurality of angularly spaced lever arms mounted thereon for simultaneous'operation; a movable member; a link interengaging keys and recesses on the said arms and link, whereby when the arms are rocked for wardly they successively engage the link ad 'im part a'forward movement'to said link and the movable member, andwhen rocked in the reverse direction they impart a reverse movementtosaid movable member, each of said recesses having a; contracted opening through which'the key enters at the commencement of its engagement with the recess and recedes at the end of itsengagement I therewith.

, pivotedat one end to the movable member; and V '2. A lever mechanism comprising two unitedly rotatable leyer'arms arranged one in advance of the other, the leading arm being longer than the following arm and provided with a projecting key, a pivoted link having a recess, into which the key enters and from, which it recedes for causing a'partial forward movement of the link during the 1 forward rotation of the lever arms, the other lever arm engaging the link and completing its forward movement when the key recedes from the recess. j f

3. In the hereinbefore described device thef cornbination oftwo unitedly rotatablelever arms arranged-one in advance of the other, the leading arm being longer than the following arm and each provided with 'a projecting key, in combination with a pivoted link interposed between the arms Zeb and the object to'be'moved', said Ii nkbeing provided" with two recesses one for the "keyof the leading arm to make a releasable connection'with thelink'for'part of its travel, and the otherfor 100 able presser board in the manner above described. v

the key of the following arm to make a releasable connection with the link and continue its travel when the key of the leading arm is released from it.

4. In the hereinbefore described device the combination of a movable member; a fixed frame on which said member is movable; a link pivoted at one end to the movable member; a shaft journalled in the frame; two angularly spaced unitedly swingable rock arms mounted on said shaft; link engaging parts on said arms; shoulders on said link spaced longitudinally thereof and successively engageable by said parts'to move the movable member in a direction away from the shaft; and a part of the leading shoulder extending rearwardly towards the shaft so as to resist disengagement of the leading arm from the said shoulder, by a simple rocking movement of the link, until the following arm is engaged with the succeeding shoulder.

5. Lever mechanism according to claim 4 in which the link and the following rock arm are provided with engaging parts which resist disengagement of the rock arm, by a simple rocking movement of the link, when the leading arm is disengaged from the link and the following arm is engaged.

6. Lever mechanism as set forth in claim 4 provided with a spring tending to move the movable member towards the shaft. I

7. Lever mechanism according to.claim 4 in which the link and the following rock arm are provided with engaging parts which resist disengagement of the rock arm, by a simple rocking movement of the link, when the leading arm is disengaged from the link and the following arm is engaged, and provided with a spring tending to move the movable member towards the shaft. 1

HUGH B. TARBOX. 

